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Couldn't find anything when searching. Heard today that for installing a 951 intake manifold and the other 951 parts, the 951 AOS should be used to physically clear everything. That's not a straightforward option for me as I'm starting with an early block (different sized ports, it won't bolt up). Can anyone offer first-hand insight on this? From pics, it looks like a normal 86+ AOS but maybe there's something I'm missing.
They measure different. My 82 and 83 AOS both measure about 28mm OD on both of the plastic legs that go into the block. On my 85.5 AOS (and I would figure a 951 would be the same given the block) the lower leg is about 32mm OD.
Maybe your block has a different "early" casting? Anyway, the novelty of building a '82 motor is wearing a little thin. Wish I had started with a late block but this'll do, I hope.
'82 part on left, '85.5 on right. and you can kind of get an idea of the provisions on the block itself.
Don't tempt me with stuff like that...I'd probably flip for a normal late NA block though, given that I have (or is in the mail) almost all of the parts needed to convert, but $450 is a good deal especially given the overall amount it's going to cost just to get the rest of the parts into the garage. Don't want to add it up, it's easily more than I spent on the car 4 years ago, but who's counting
So the question stands, has anyone been able to fit a NA AOS without clashing? AOS delete doesn't appeal to me. It'll be at least a week or two before I can actually fit this together.
Yes Spencer is right again. Just add a port to the top for the ventilation tube from the turbocharger motor mount and it is the same besides the lower port. I would get a 951 block Michael. Trust me your block is most likely a zero tolerance piston group and all turbo pistons are group one or group two for the turbo s and 89 turbo blocks as far as I know. You can drill out an 86 block for auto timing tensioner. The only real benefit to an 87+ block is the cheaper 1 piece OPRV.
Hmm, didn't know about that ventilation port - wish I had an actual 951 around to use as reference. Looks simple enough to incorporate that.
The block is tolerance group 1 luckily, in fact every motor I've opened up this far has been group 1. So I would bet it was the "bell curve" majority. I'm sticking with a manual tensioner, but the other mods I want to make to this block are 1) drill and tap for knock sensor (you can kind of see the pilot hole in the pic) and 2) I need to find a way, that isn't a leaky sandwich plate, to get an oil feed line to the turbo. 82 balance shaft covers = not an option for oil feed.
You have to drill thru the ballance shaft cover and tap the hole that's cast into the cover. 104mm blocks are the same style but if I remember there mounting holes are different size amd/or it's a different bolt pattern at the rear bearing.
There's a bearing cap on 85.5+ blocks (looks like the cam retainers on a 16v head) but on early cars, the balance shaft cover itself houses the outer bearing shell. I guess theoretically there could be modification to it. Has anyone experimented with that on an early block? Otherwise I'm going to probably get one of those oil filters with a port on the top for an oil line.
btw Humboldtgrin there's someone on the main 944 forum looking to buy a 951 airbox.
Good to know, thanks. I'll replace it on mine since every other seal is nowhere close to usable. Does the top come off easily enough? I thought it wasn't designed to be serviceable.
Gently prying with 2-3 small screwdrivers is all it takes.
You'll see there are little tabs holding it in place, in each of the little "slots" around the perimeter of the top.
04-04-2016, 07:22 PM
Will an AOS from an NA clear a 951 manifold?
